^That is a good point also. Before the invention of recording on tape and LP discs, you could only fit up to around 5 of music on one side of a disc, so you had to 1) break the works up in sub 5 minute chunks which you recorded and 2) play faster or make cuts if necessary to be able to fit it onto a reasonable number of sides. For example if you could fit a work onto two sides by playing slightly faster and cutting a repeat, you often did that.
That being said, if you look at Cortot's discography, the overall duration of the works he recorded rarely changed during his career, but rather most works stayed the same duration even after the invention of tape recording (though he did slow down a bit in fast parts as he aged, he often compensated by playing slower parts a bit faster to get the same overall duration).